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【单选题】
下列关于网状模型叙述正确的是().A.
仅有一个无双亲的结点
B.
一个结点可以有多个双亲
C.
支持多对多联系
D.
单一的数据结构
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【简答题】I suppose that the most basic and powerful way to connect to another person is to listen. Just listen. Perhaps the most important thing we ever give each other is our attention. And especially if it’s...
【简答题】一个数据库只能有一个( )文件。一个数据库可以有( )或多个( )文件。
【单选题】Suppose that M is fixed but that P falls. According to the quantity equation which of the following could both by themselves explain the decrease in P?
A.
Y rose, V rose
B.
Y fell, V fell
C.
Y rose, V fell
D.
Y fell, V rose
【单选题】From 8 pm to 10 pm, Susan can attend a movie, study, or talk with friends. Suppose that Susan decides to go to the movie but thinks that, if she hadn't, she would otherwise have talked with friends. T...
A.
talking with friends and studying.
B.
studying.
C.
talking with friends.
D.
two hours of time.
【多选题】下列关于视图作用描述正确的是:
A.
简化用户的操作
B.
使用户能以多种角度看待同一数据
C.
对重构数据库提供了一定程度的逻辑独立性
D.
视图机制提高了系统的安全性
【单选题】听力原文：W: I want to pay you for that long distance call I made. But I suppose you haven't gotten you phone bill yet. M: Oh, but I have. Q: What does the man mean? (15)
A.
He has got the phone bill.
B.
His calls weren't included.
C.
The woman doesn't need to pay for it.
D.
He has received a long-distance call.
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